还支持采用不同颜色的双线显示的错误链接。
Fault links are supported as well, shown with double-lines in a different color.
错误链接采用不同于正常链接的颜色显示的双线来指示。
Fault links are indicated by a double line in an alternate color from normal links.
该IM21模块还配备了一个双线路，半透反射式LCD显示器，即使是在强光条件下，也会促进良好的可读性。
The IM21 module is also equipped with a dual-line transflective LCD display that promotes excellent readability, even in bright lighting conditions.
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